31 lines
1.3 KiB
Diff
31 lines
1.3 KiB
Diff
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# Commit f8ecf31c31906552522c2a1b0d1cada07d78876e
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# Date 2014-05-26 12:28:46 +0200
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# Author Jan Beulich <jbeulich@suse.com>
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# Committer Jan Beulich <jbeulich@suse.com>
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VT-d: fix mask applied to DMIBAR in desktop chipset XSA-59 workaround
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In commit ("VT-d: suppress UR signaling for desktop chipsets")
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the mask applied to the value read from DMIBAR is to narrow, only the
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comment accompanying it was correct. Fix that and tag the literal
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number as "long" at once to avoid eventual compiler warnings.
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The widest possible value so far is 39 bits; all chipsets covered here
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but having less than this number of bits have the remaining bits marked
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reserved (zero), and hence there's no need for making the mask chipset
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specific.
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Signed-off-by: Jan Beulich <jbeulich@suse.com>
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Acked-by: Yang Zhang <yang.z.zhang@intel.com>
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--- a/xen/drivers/passthrough/vtd/quirks.c
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+++ b/xen/drivers/passthrough/vtd/quirks.c
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@@ -467,7 +467,7 @@ void pci_vtd_quirk(const struct pci_dev
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case 0xc00: case 0xc04: case 0xc08: /* Haswell */
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bar = pci_conf_read32(seg, bus, dev, func, 0x6c);
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bar = (bar << 32) | pci_conf_read32(seg, bus, dev, func, 0x68);
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- pa = bar & 0x7fffff000; /* bits 12...38 */
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+ pa = bar & 0x7ffffff000UL; /* bits 12...38 */
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if ( (bar & 1) && pa &&
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page_is_ram_type(paddr_to_pfn(pa), RAM_TYPE_RESERVED) )
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{
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